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Futaba reveiver voltage question...

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Old 08-22-2003, 01:33 AM
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jchuston
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Default Futaba reveiver voltage question...

OK, so I emailed Futaba support the other day to ask about using 2 cell Li-poly packs with my futaba receivers...Apparently, the site states that the input voltage for the receiver is 4.8-6.0 V and I just wanted to check and see if 7.4 was too much. The dude replied to tell me that the Futaba receiver can take up to 10.0 V but the servos cannot...now, does anyone know the validity of this statement??? I tend to want to agree with the guy, but it seems that the receiver would have more of a problem dealing with excess voltage than the servos...maybe the servos will not last as long...I don't know...

Anyways, does anyone use a 7.4 volt Li-poly pack with a Futaba receiver (without a regulator)???


-John
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Old 08-22-2003, 02:30 AM
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Lynx
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Default Futaba reveiver voltage question...

jchuston, the receiver can deal with as much voltage as the internal regulator allows. It automatically adjusts any voltage up to a certain value down to one that will not harm the receiver. If the guy from Futaba said 10 volts you can bank on it. However he's right, 10 volts will cause your servo's to glow in the dark => The receiver only adjusts the voltage for it's own use, not to the power bus where the servo's plug in.
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Old 08-22-2003, 03:25 AM
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MHawker
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Default Futaba reveiver voltage question...

Could you use an ESC as your regulator? It has a 5 volt output that plugs right into the RX.
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Old 08-23-2003, 05:40 AM
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Lynx
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Default Futaba reveiver voltage question...

ESC regulators can't usually source enough current for the receiver and servo's. Most ESC's only have an amp or two output capacity. Check your ESC's spec sheets.
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Old 08-23-2003, 03:17 PM
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Geistware
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Default Futaba reveiver voltage question...

Two rectifier diodes in series will reduce the voltage, but I would use a regulator for your application
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